Rebate u/s 87A on short term capital gains

Unfortunately, there's no remedy available at this point. The demand has been raised due to a defect in the utility that incorrectly allowed the rebate under Section 87A on Short-Term Capital Gains (STCG) in the new tax regime. 

This issue was fixed in a newer version of the utility. Given that you've already filed your ITR under the new regime, you can only file a revised return under the new regime, but the last date to file revised returns was January 15, 2025. 

Now, your options might be limited to filing an ITR-U (Updated Return), which also defaults to the new tax regime.

I think the simplest way is pay tax and forget it.

No need for any revision of returns etc.

I would also like to be corrected in my aforesaid thinking.

File rectification request or raise a grievance if you want to fight

If not can pay the same and finish it off